OK. So ya got 3oz in front & 2oz in back. That don't compute!!!!! Either put the weight in front or in back, NOT both. Most of the RTF planes are not power houses so ya need to keep the weight to a minimum. It sounds ot me like maybe you'll need an ounce or so in the nose ( it's according were in the nose you put it.) It can make a BIG difference between the firewall & the front of the cowl. Just take your time.